Trying to fix the windshield wipers on my 1997 Ford Ranger. When I start the truck, the wipers will run for 10 seconds and then shut off, but not mid-cycle; the wipers return to their starting position at the bottom of the windshield. They will not turn on afterwards, and will not turn on if I shut off the ignition and restart. Have a multimeter but no continuity tester. Thanks for any help, Paul.